jnr.ffi.provider.AbstractRuntime Maven / Gradle / Ivy
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/*
* Copyright (C) 2008-2010 Wayne Meissner
*
* This file is part of the JNR project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jnr.ffi.provider;
import jnr.ffi.NativeType;
import jnr.ffi.Runtime;
import jnr.ffi.Type;
import java.nio.ByteOrder;
import java.util.EnumMap;
import java.util.EnumSet;
/**
*
*/
public abstract class AbstractRuntime extends Runtime {
private final Type[] types;
private final long addressMask;
private final int addressSize;
private final int longSize;
private final ByteOrder byteOrder;
public AbstractRuntime(ByteOrder byteOrder, EnumMap typeMap) {
this.byteOrder = byteOrder;
EnumSet nativeTypes = EnumSet.allOf(NativeType.class);
types = new Type[nativeTypes.size()];
for (NativeType t : nativeTypes) {
types[t.ordinal()] = typeMap.containsKey(t) ? typeMap.get(t) : new BadType(t.toString());
}
this.addressSize = types[NativeType.ADDRESS.ordinal()].size();
this.longSize = types[NativeType.SLONG.ordinal()].size();
this.addressMask = addressSize == 4 ? 0xffffffffL : 0xffffffffffffffffL;
}
/** Looks up the runtime-specific that corresponds to the pseudo-type */
public final Type findType(NativeType type) {
return types[type.ordinal()];
}
/**
* Gets the native memory manager instance for this runtime
*
* @return a {@link MemoryManager}
*/
public abstract MemoryManager getMemoryManager();
/**
* Gets the last native error code.
*
* This returns the errno value that was set at the time of the last native
* function call.
*
* @return The errno value.
*/
public abstract int getLastError();
/**
* Sets the native error code.
*
* @param error The value to set errno to.
*/
public abstract void setLastError(int error);
/** Gets the address mask for this runtime */
public final long addressMask() {
return addressMask;
}
/**
* Gets the size of an address (e.g. a pointer) for this runtime
*
* @return The size of an address in bytes.
*/
public final int addressSize() {
return addressSize;
}
/**
* Gets the size of a C long integer for this runtime
*
* @return The size of a C long integer in bytes.
*/
public final int longSize() {
return longSize;
}
/**
* Retrieves this runtime's native byte order.
*
* @return this runtime's byte order
*/
public final ByteOrder byteOrder() {
return byteOrder;
}
}